I've got a friend that put a G-23 on his. It flew but it sure was heavy and it didn't fly with much authority. An os 108 will do wonders as will a 120 4-stroke. These will give you unlimited power if you need it. If you are wanting gas a 1.4 or 1.8 should work nicely on it. You can look at them at the RCS Showcase web-site.
Electropiep